update_daemon2.php

   1 #!/usr/bin/env php
   2 <?php
   3         set_include_path(dirname(__FILE__) ."/include" . PATH_SEPARATOR .
   4                 get_include_path());
   5
   6         declare(ticks = 1);
   7         chdir(dirname(__FILE__));
   8
   9         define('DISABLE_SESSIONS', true);
  10
  11         require_once "version.php";
  12
  13         if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) {
  14                 define('DAEMON_EXTENDED_DEBUG', true);
  15         }
  16
  17         define('PURGE_INTERVAL', 3600); // seconds
  18         define('MAX_CHILD_RUNTIME', 600); // seconds
  19
  20         require_once "functions.php";
  21         require_once "rssfuncs.php";
  22         require_once "sanity_check.php";
  23         require_once "config.php";
  24         require_once "db.php";
  25         require_once "db-prefs.php";
  26
  27         define('MAX_JOBS', 2);
  28         define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL);
  29
  30         if (!function_exists('pcntl_fork')) {
  31                 die("error: This script requires PHP compiled with PCNTL module.\n");
  32         }
  33
  34         $master_handlers_installed = false;
  35
  36         $children = array();
  37         $ctimes = array();
  38
  39         $last_checkpoint = -1;
  40
  41         function reap_children() {
  42                 global $children;
  43                 global $ctimes;
  44
  45                 $tmp = array();
  46
  47                 foreach ($children as $pid) {
  48                         if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) {
  49
  50                                 if (file_is_locked("update_daemon-$pid.lock")) {
  51                                         array_push($tmp, $pid);
  52                                 } else {
  53                                         _debug("[reap_children] child $pid seems active but lockfile is unlocked.");
  54                                         unset($ctimes[$pid]);
  55
  56                                 }
  57                         } else {
  58                                 _debug("[reap_children] child $pid reaped.");
  59                                 unset($ctimes[$pid]);
  60                         }
  61                 }
  62
  63                 $children = $tmp;
  64
  65                 return count($tmp);
  66         }
  67
  68         function check_ctimes() {
  69                 global $ctimes;
  70
  71                 foreach (array_keys($ctimes) as $pid) {
  72                         $started = $ctimes[$pid];
  73
  74                         if (time() - $started > MAX_CHILD_RUNTIME) {
  75                                 _debug("[MASTER] child process $pid seems to be stuck, aborting...");
  76                                 posix_kill($pid, SIGKILL);
  77                         }
  78                 }
  79         }
  80
  81         function sigchld_handler($signal) {
  82                 $running_jobs = reap_children();
  83
  84                 _debug("[SIGCHLD] jobs left: $running_jobs");
  85
  86                 pcntl_waitpid(-1, $status, WNOHANG);
  87         }
  88
  89         function shutdown($caller_pid) {
  90                 if ($caller_pid == posix_getpid()) {
  91                         if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) {
  92                                 _debug("removing lockfile (master)...");
  93                                 unlink(LOCK_DIRECTORY . "/update_daemon.lock");
  94                         }
  95                 }
  96         }
  97
  98         function task_shutdown() {
  99                 $pid = posix_getpid();
 100
 101                 if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock")) {
 102                         _debug("removing lockfile ($pid)...");
 103                         unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock");
 104                 }
 105         }
 106
 107         function sigint_handler() {
 108                 _debug("[MASTER] SIG_INT received.\n");
 109                 shutdown(posix_getpid());
 110                 die;
 111         }
 112
 113         function task_sigint_handler() {
 114                 _debug("[TASK] SIG_INT received.\n");
 115                 task_shutdown();
 116                 die;
 117         }
 118
 119         pcntl_signal(SIGCHLD, 'sigchld_handler');
 120
 121         if (file_is_locked("update_daemon.lock")) {
 122                 die("error: Can't create lockfile. ".
 123                         "Maybe another daemon is already running.\n");
 124         }
 125
 126         // Try to lock a file in order to avoid concurrent update.
 127         $lock_handle = make_lockfile("update_daemon.lock");
 128
 129         if (!$lock_handle) {
 130                 die("error: Can't create lockfile. ".
 131                         "Maybe another daemon is already running.\n");
 132         }
 133
 134         // Testing database connection.
 135         // It is unnecessary to start the fork loop if database is not ok.
 136         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 137
 138         if (!init_connection($link)) return;
 139
 140         db_close($link);
 141
 142         while (true) {
 143
 144                 // Since sleep is interupted by SIGCHLD, we need another way to
 145                 // respect the SPAWN_INTERVAL
 146                 $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time();
 147
 148                 if ($next_spawn % 10 == 0) {
 149                         $running_jobs = count($children);
 150                         _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec.");
 151                 }
 152
 153                 if ($last_checkpoint + SPAWN_INTERVAL < time()) {
 154
 155                         check_ctimes();
 156                         reap_children();
 157
 158                         for ($j = count($children); $j < MAX_JOBS; $j++) {
 159                                 $pid = pcntl_fork();
 160                                 if ($pid == -1) {
 161                                         die("fork failed!\n");
 162                                 } else if ($pid) {
 163
 164                                         if (!$master_handlers_installed) {
 165                                                 _debug("[MASTER] installing shutdown handlers");
 166                                                 pcntl_signal(SIGINT, 'sigint_handler');
 167                                                 register_shutdown_function('shutdown', posix_getpid());
 168                                                 $master_handlers_installed = true;
 169                                         }
 170
 171                                         _debug("[MASTER] spawned client $j [PID:$pid]...");
 172                                         array_push($children, $pid);
 173                                         $ctimes[$pid] = time();
 174                                 } else {
 175                                         pcntl_signal(SIGCHLD, SIG_IGN);
 176                                         pcntl_signal(SIGINT, 'task_sigint_handler');
 177
 178                                         register_shutdown_function('task_shutdown');
 179
 180                                         $my_pid = posix_getpid();
 181                                         $lock_filename = "update_daemon-$my_pid.lock";
 182
 183                                         $lock_handle = make_lockfile($lock_filename);
 184
 185                                         if (!$lock_handle) {
 186                                                 die("error: Can't create lockfile ($lock_filename). ".
 187                                                 "Maybe another daemon is already running.\n");
 188                                         }
 189
 190                                         // ****** Updating RSS code *******
 191                                         // Only run in fork process.
 192
 193                                         $start_timestamp = time();
 194
 195                                         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 196
 197                                         if (!init_connection($link)) return;
 198
 199                                         // We disable stamp file, since it is of no use in a multiprocess update.
 200                                         // not really, tho for the time being -fox
 201                                         if (!make_stampfile('update_daemon.stamp')) {
 202                                                 die("error: unable to create stampfile\n");
 203                                         }
 204
 205                                         // Call to the feed batch update function
 206                                         // or regenerate feedbrowser cache
 207
 208                                         if (rand(0,100) > 30) {
 209                                                 update_daemon_common($link);
 210                                         } else {
 211                                                 $count = update_feedbrowser_cache($link);
 212                                                 _debug("Feedbrowser updated, $count feeds processed.");
 213
 214                                                 purge_orphans($link, true);
 215
 216                                                 $rc = cleanup_tags($link, 14, 50000);
 217
 218                                                 _debug("Cleaned $rc cached tags.");
 219
 220                                                 global $pluginhost;
 221                                                 $pluginhost->run_hooks($pluginhost::HOOK_UPDATE_TASK, "hook_update_task", $op);
 222                                         }
 223
 224                                         _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)");
 225
 226                                         db_close($link);
 227
 228                                         // We are in a fork.
 229                                         // We wait a little before exiting to avoid to be faster than our parent process.
 230                                         sleep(1);
 231
 232                                         unlink(LOCK_DIRECTORY . "/$lock_filename");
 233
 234                                         // We exit in order to avoid fork bombing.
 235                                         exit(0);
 236                                 }
 237
 238                                 // We wait a little time before the next fork, in order to let the first fork
 239                                 // mark the feeds it update :
 240                                 sleep(1);
 241                         }
 242                         $last_checkpoint = time();
 243                 }
 244                 sleep(1);
 245         }
 246
 247 ?>